linux-kernel - Re: [patch 2/9] procfs: Convert /proc/pid/fdinfo/ handling routines to seq-file v2

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Date:	Sun, 26 Aug 2012 12:13:34 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	aneesh.kumar@...ux.vnet.ibm.com, bfields@...ldses.org
Subject: Re: [patch 2/9] procfs: Convert /proc/pid/fdinfo/ handling routines
 to seq-file v2

On Sun, Aug 26, 2012 at 03:46:53AM +0100, Al Viro wrote:
> On Thu, Aug 23, 2012 at 02:43:25PM +0400, Cyrill Gorcunov wrote:
> > This patch converts /proc/pid/fdinfo/ handling routines to seq-file which
> > is needed to extend seq operations and plug in auxiliary fdinfo provides
> > from subsystems like eventfd/eventpoll/fsnotify.
> > 
> > Note the proc_fd_link no longer call for proc_fd_info, simply because
> > proc_fd_info is converted to seq_fdinfo_open (which is seq-file open()
> > prototype).
> 
> Actually, now that I've looked at it a bit more...  You've just introduced
> an ABI change here.  Look:

Crap, ineed. Thanks, Al! I'll fix it up, sorry.

...

> IMO doing that at open() time is just a headache for no good reason -
> resolving descriptor to struct file * at read() time as we do now
> is much saner.  Better do that in your ->show(), since you are using
> a single-shot iterator anyway...

Oh, thanks for the hint, Al! I'll rework and send an updated version.

	Cyrill
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